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  <pre class="prettyprint lang-js"><span id='Ext-grid-CheckboxSelectionModel-method-constructor'><span id='Ext-grid-CheckboxSelectionModel'>/**
</span></span> * @class Ext.grid.CheckboxSelectionModel
 * @extends Ext.grid.RowSelectionModel
 * A custom selection model that renders a column of checkboxes that can be toggled to select or deselect rows.
 * @constructor
 * @param {Object} config The configuration options
 */
Ext.grid.CheckboxSelectionModel = Ext.extend(Ext.grid.RowSelectionModel, {

<span id='Ext-grid-CheckboxSelectionModel-cfg-checkOnly'>    /**
</span>     * @cfg {Boolean} checkOnly &lt;tt&gt;true&lt;/tt&gt; if rows can only be selected by clicking on the
     * checkbox column (defaults to &lt;tt&gt;false&lt;/tt&gt;).
     */
<span id='Ext-grid-CheckboxSelectionModel-cfg-header'>    /**
</span>     * @cfg {String} header Any valid text or HTML fragment to display in the header cell for the
     * checkbox column.  Defaults to:&lt;pre&gt;&lt;code&gt;
     * '&amp;lt;div class=&quot;x-grid3-hd-checker&quot;&gt;&amp;#38;#160;&amp;lt;/div&gt;'&lt;/tt&gt;
     * &lt;/code&gt;&lt;/pre&gt;
     * The default CSS class of &lt;tt&gt;'x-grid3-hd-checker'&lt;/tt&gt; displays a checkbox in the header
     * and provides support for automatic check all/none behavior on header click. This string
     * can be replaced by any valid HTML fragment, including a simple text string (e.g.,
     * &lt;tt&gt;'Select Rows'&lt;/tt&gt;), but the automatic check all/none behavior will only work if the
     * &lt;tt&gt;'x-grid3-hd-checker'&lt;/tt&gt; class is supplied.
     */
    header : '&lt;div class=&quot;x-grid3-hd-checker&quot;&gt;&amp;#160;&lt;/div&gt;',
<span id='Ext-grid-CheckboxSelectionModel-cfg-width'>    /**
</span>     * @cfg {Number} width The default width in pixels of the checkbox column (defaults to &lt;tt&gt;20&lt;/tt&gt;).
     */
    width : 20,
<span id='Ext-grid-CheckboxSelectionModel-cfg-sortable'>    /**
</span>     * @cfg {Boolean} sortable &lt;tt&gt;true&lt;/tt&gt; if the checkbox column is sortable (defaults to
     * &lt;tt&gt;false&lt;/tt&gt;).
     */
    sortable : false,

<span id='Ext-grid-CheckboxSelectionModel-property-menuDisabled'>    // private
</span>    menuDisabled : true,
<span id='Ext-grid-CheckboxSelectionModel-property-fixed'>    fixed : true,
</span><span id='Ext-grid-CheckboxSelectionModel-property-hideable'>    hideable: false,
</span><span id='Ext-grid-CheckboxSelectionModel-property-dataIndex'>    dataIndex : '',
</span><span id='Ext-grid-CheckboxSelectionModel-property-id'>    id : 'checker',
</span><span id='Ext-grid-CheckboxSelectionModel-method-constructor'><span id='Ext-grid-CheckboxSelectionModel-property-isColumn'>    isColumn: true, // So that ColumnModel doesn't feed this through the Column constructor
</span></span>
    constructor : function(){
        Ext.grid.CheckboxSelectionModel.superclass.constructor.apply(this, arguments);
        if(this.checkOnly){
            this.handleMouseDown = Ext.emptyFn;
        }
    },

<span id='Ext-grid-CheckboxSelectionModel-method-initEvents'>    // private
</span>    initEvents : function(){
        Ext.grid.CheckboxSelectionModel.superclass.initEvents.call(this);
        this.grid.on('render', function(){
            Ext.fly(this.grid.getView().innerHd).on('mousedown', this.onHdMouseDown, this);
        }, this);
    },

<span id='Ext-grid-CheckboxSelectionModel-method-processEvent'>    /**
</span>     * @private
     * Process and refire events routed from the GridView's processEvent method.
     */
    processEvent : function(name, e, grid, rowIndex, colIndex){
        if (name == 'mousedown') {
            this.onMouseDown(e, e.getTarget());
            return false;
        } else {
            return Ext.grid.Column.prototype.processEvent.apply(this, arguments);
        }
    },

<span id='Ext-grid-CheckboxSelectionModel-method-onMouseDown'>    // private
</span>    onMouseDown : function(e, t){
        if(e.button === 0 &amp;&amp; t.className == 'x-grid3-row-checker'){ // Only fire if left-click
            e.stopEvent();
            var row = e.getTarget('.x-grid3-row');
            if(row){
                var index = row.rowIndex;
                if(this.isSelected(index)){
                    this.deselectRow(index);
                }else{
                    this.selectRow(index, true);
                    this.grid.getView().focusRow(index);
                }
            }
        }
    },

<span id='Ext-grid-CheckboxSelectionModel-method-onHdMouseDown'>    // private
</span>    onHdMouseDown : function(e, t) {
        if(t.className == 'x-grid3-hd-checker'){
            e.stopEvent();
            var hd = Ext.fly(t.parentNode);
            var isChecked = hd.hasClass('x-grid3-hd-checker-on');
            if(isChecked){
                hd.removeClass('x-grid3-hd-checker-on');
                this.clearSelections();
            }else{
                hd.addClass('x-grid3-hd-checker-on');
                this.selectAll();
            }
        }
    },

<span id='Ext-grid-CheckboxSelectionModel-method-renderer'>    // private
</span>    renderer : function(v, p, record){
        return '&lt;div class=&quot;x-grid3-row-checker&quot;&gt;&amp;#160;&lt;/div&gt;';
    },
    
<span id='Ext-grid-CheckboxSelectionModel-method-onEditorSelect'>    onEditorSelect: function(row, lastRow){
</span>        if(lastRow != row &amp;&amp; !this.checkOnly){
            this.selectRow(row); // *** highlight newly-selected cell and update selection
        }
    }
});</pre>
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